diff --git a/gdk/Pixdata.custom b/gdk/Pixdata.custom
index f87db1268..7aa0d1c70 100644
--- a/gdk/Pixdata.custom
+++ b/gdk/Pixdata.custom
@@ -25,6 +25,6 @@
 
 		byte [] data = new byte [len];
 		Marshal.Copy (raw_ret, data, 0, (int)len);
-		
+		GLib.Marshaller.Free (raw_ret);
 		return data;
 	}